#!/bin/bash
# ----------------------------- 下载优化 ---------------------------------
# 删除初始源
rm -rf /etc/yum.repos.d/*
# 阿里centos7源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
# 阿里epel源
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
# nginx官方stable源
cat >/etc/yum.repos.d/nginx.repo<<EOF
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/\$releasever/\$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true
EOF
# 清除缓存
yum clean all
# 建立新缓存
yum makecache
# 更新软件
yum update -y
# 安装常用软件
yum -y install python-setuptools python-pip gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel zipqunzip ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5-devel libidn libidn-devel openssl openssh openssl-develnss_ldap openldap openldap-devel openldap-clients openldap-servers libxslt-devel libevent-devel ntp libtool-ltdl bison libtool vim-enhanced python wget lsof iptraf strace lrzsz kernel-devel kernel-headers pam-devel tcl tk cmake ncurses-devel bisonsetuptool popt-devel net-snmp screen perl-devel pcre-devel net-snmp screen tcpdump rsync sysstat man iptables sudo libconfiggit bind-utils tmux elinks numactl iftop bwm-ng net-tools expect

# ------------------------------ 系统优化 ---------------------------
# 关闭selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
systemctl disable --now NetworkManage
# 关闭防火墙
systemctl disable --now firewalld
# 每一小时从阿里云那里同步一次时间
echo '#Timing synchronization time' >>/var/spool/cron/root
echo '0 */1 * * * /usr/sbin/ntpdate ntp1.aliyun.com &>/dev/null' >>/var/spool/cron/root
# 系统参数优化
cat >>/etc/sysctl.conf <<EOF
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_keepalive_time = 600
net.ipv4.ip_local_port_range = 4000    65000
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
net.ipv4.tcp_max_orphans = 16384
net.ipv4.ip_forward = 1
EOF
# 生效
sysctl -p

# ssh优化
sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
systemctl restart sshd

# 关闭不常用的东西
systemctl disable abrt-ccpp.service
systemctl disable abrt-oops.service
systemctl disable abrt-vmcore.service
systemctl disable abrt-xorg.service
systemctl disable abrtd.service
systemctl disable accounts-daemon.service
systemctl disable atd.service
systemctl disable auditd.service
systemctl disable autovt@.service
systemctl disable avahi-daemon.service
systemctl disable bluetooth.service
systemctl disable cups.service
systemctl disable dbus-org.bluez.service
systemctl disable dbus-org.fedoraproject.FirewallD1.service
systemctl disable dbus-org.freedesktop.Avahi.service
systemctl disable dbus-org.freedesktop.ModemManager1.service
systemctl disable dbus-org.freedesktop.NetworkManager.service
systemctl disable dbus-org.freedesktop.nm-dispatcher.service
systemctl disable display-manager.service
systemctl disable dmraid-activation.service
systemctl disable firewalld.service
systemctl disable gdm.service
systemctl disable irqbalance.service
systemctl disable iscsi.service
systemctl disable ksm.service
systemctl disable ksmtuned.service
systemctl disable libstoragemgmt.service
systemctl disable libvirtd.service
systemctl disable lvm2-monitor.service
systemctl disable mcelog.service
systemctl disable mdmonitor.service
systemctl disable microcode.service
systemctl disable ModemManager.service
systemctl disable multipathd.service
systemctl disable NetworkManager-dispatcher.service
systemctl disable NetworkManager.service
systemctl disable postfix.service
systemctl disable qemu-guest-agent.service
systemctl disable rngd.service
systemctl disable rtkit-daemon.service
systemctl disable smartd.service
systemctl disable spice-vdagentd.service
systemctl disable systemd-readahead-collect.service
systemctl disable systemd-readahead-drop.service
systemctl disable systemd-readahead-replay.service
systemctl disable tuned.service
systemctl disable vgauthd.service
systemctl disable vmtoolsd.service

